2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
19 #include <kvm/iodev.h>
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/ioctl.h>
56 #include <asm/uaccess.h>
57 #include <asm/pgtable.h>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 MODULE_AUTHOR("Qumranet");
67 MODULE_LICENSE("GPL");
69 static unsigned int halt_poll_ns
;
70 module_param(halt_poll_ns
, uint
, S_IRUGO
| S_IWUSR
);
75 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
78 DEFINE_SPINLOCK(kvm_lock
);
79 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
82 static cpumask_var_t cpus_hardware_enabled
;
83 static int kvm_usage_count
;
84 static atomic_t hardware_enable_failed
;
86 struct kmem_cache
*kvm_vcpu_cache
;
87 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
89 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
91 struct dentry
*kvm_debugfs_dir
;
92 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
94 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
96 #ifdef CONFIG_KVM_COMPAT
97 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
100 static int hardware_enable_all(void);
101 static void hardware_disable_all(void);
103 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
105 static void kvm_release_pfn_dirty(pfn_t pfn
);
106 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
108 __visible
bool kvm_rebooting
;
109 EXPORT_SYMBOL_GPL(kvm_rebooting
);
111 static bool largepages_enabled
= true;
113 bool kvm_is_reserved_pfn(pfn_t pfn
)
116 return PageReserved(pfn_to_page(pfn
));
122 * Switches to specified vcpu, until a matching vcpu_put()
124 int vcpu_load(struct kvm_vcpu
*vcpu
)
128 if (mutex_lock_killable(&vcpu
->mutex
))
131 preempt_notifier_register(&vcpu
->preempt_notifier
);
132 kvm_arch_vcpu_load(vcpu
, cpu
);
137 void vcpu_put(struct kvm_vcpu
*vcpu
)
140 kvm_arch_vcpu_put(vcpu
);
141 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
143 mutex_unlock(&vcpu
->mutex
);
146 static void ack_flush(void *_completed
)
150 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
155 struct kvm_vcpu
*vcpu
;
157 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
160 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
161 kvm_make_request(req
, vcpu
);
164 /* Set ->requests bit before we read ->mode */
167 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
168 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
169 cpumask_set_cpu(cpu
, cpus
);
171 if (unlikely(cpus
== NULL
))
172 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
173 else if (!cpumask_empty(cpus
))
174 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
178 free_cpumask_var(cpus
);
182 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
183 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
185 long dirty_count
= kvm
->tlbs_dirty
;
188 if (kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
189 ++kvm
->stat
.remote_tlb_flush
;
190 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
192 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
195 void kvm_reload_remote_mmus(struct kvm
*kvm
)
197 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
200 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
202 kvm_make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
205 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
207 kvm_make_all_cpus_request(kvm
, KVM_REQ_SCAN_IOAPIC
);
210 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
215 mutex_init(&vcpu
->mutex
);
220 init_waitqueue_head(&vcpu
->wq
);
221 kvm_async_pf_vcpu_init(vcpu
);
223 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
228 vcpu
->run
= page_address(page
);
230 kvm_vcpu_set_in_spin_loop(vcpu
, false);
231 kvm_vcpu_set_dy_eligible(vcpu
, false);
232 vcpu
->preempted
= false;
234 r
= kvm_arch_vcpu_init(vcpu
);
240 free_page((unsigned long)vcpu
->run
);
244 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
246 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
249 kvm_arch_vcpu_uninit(vcpu
);
250 free_page((unsigned long)vcpu
->run
);
252 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
254 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
255 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
257 return container_of(mn
, struct kvm
, mmu_notifier
);
260 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
261 struct mm_struct
*mm
,
262 unsigned long address
)
264 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
265 int need_tlb_flush
, idx
;
268 * When ->invalidate_page runs, the linux pte has been zapped
269 * already but the page is still allocated until
270 * ->invalidate_page returns. So if we increase the sequence
271 * here the kvm page fault will notice if the spte can't be
272 * established because the page is going to be freed. If
273 * instead the kvm page fault establishes the spte before
274 * ->invalidate_page runs, kvm_unmap_hva will release it
277 * The sequence increase only need to be seen at spin_unlock
278 * time, and not at spin_lock time.
280 * Increasing the sequence after the spin_unlock would be
281 * unsafe because the kvm page fault could then establish the
282 * pte after kvm_unmap_hva returned, without noticing the page
283 * is going to be freed.
285 idx
= srcu_read_lock(&kvm
->srcu
);
286 spin_lock(&kvm
->mmu_lock
);
288 kvm
->mmu_notifier_seq
++;
289 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
290 /* we've to flush the tlb before the pages can be freed */
292 kvm_flush_remote_tlbs(kvm
);
294 spin_unlock(&kvm
->mmu_lock
);
296 kvm_arch_mmu_notifier_invalidate_page(kvm
, address
);
298 srcu_read_unlock(&kvm
->srcu
, idx
);
301 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
302 struct mm_struct
*mm
,
303 unsigned long address
,
306 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
309 idx
= srcu_read_lock(&kvm
->srcu
);
310 spin_lock(&kvm
->mmu_lock
);
311 kvm
->mmu_notifier_seq
++;
312 kvm_set_spte_hva(kvm
, address
, pte
);
313 spin_unlock(&kvm
->mmu_lock
);
314 srcu_read_unlock(&kvm
->srcu
, idx
);
317 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
318 struct mm_struct
*mm
,
322 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
323 int need_tlb_flush
= 0, idx
;
325 idx
= srcu_read_lock(&kvm
->srcu
);
326 spin_lock(&kvm
->mmu_lock
);
328 * The count increase must become visible at unlock time as no
329 * spte can be established without taking the mmu_lock and
330 * count is also read inside the mmu_lock critical section.
332 kvm
->mmu_notifier_count
++;
333 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
334 need_tlb_flush
|= kvm
->tlbs_dirty
;
335 /* we've to flush the tlb before the pages can be freed */
337 kvm_flush_remote_tlbs(kvm
);
339 spin_unlock(&kvm
->mmu_lock
);
340 srcu_read_unlock(&kvm
->srcu
, idx
);
343 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
344 struct mm_struct
*mm
,
348 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
350 spin_lock(&kvm
->mmu_lock
);
352 * This sequence increase will notify the kvm page fault that
353 * the page that is going to be mapped in the spte could have
356 kvm
->mmu_notifier_seq
++;
359 * The above sequence increase must be visible before the
360 * below count decrease, which is ensured by the smp_wmb above
361 * in conjunction with the smp_rmb in mmu_notifier_retry().
363 kvm
->mmu_notifier_count
--;
364 spin_unlock(&kvm
->mmu_lock
);
366 BUG_ON(kvm
->mmu_notifier_count
< 0);
369 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
370 struct mm_struct
*mm
,
374 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
377 idx
= srcu_read_lock(&kvm
->srcu
);
378 spin_lock(&kvm
->mmu_lock
);
380 young
= kvm_age_hva(kvm
, start
, end
);
382 kvm_flush_remote_tlbs(kvm
);
384 spin_unlock(&kvm
->mmu_lock
);
385 srcu_read_unlock(&kvm
->srcu
, idx
);
390 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
391 struct mm_struct
*mm
,
392 unsigned long address
)
394 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
397 idx
= srcu_read_lock(&kvm
->srcu
);
398 spin_lock(&kvm
->mmu_lock
);
399 young
= kvm_test_age_hva(kvm
, address
);
400 spin_unlock(&kvm
->mmu_lock
);
401 srcu_read_unlock(&kvm
->srcu
, idx
);
406 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
407 struct mm_struct
*mm
)
409 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
412 idx
= srcu_read_lock(&kvm
->srcu
);
413 kvm_arch_flush_shadow_all(kvm
);
414 srcu_read_unlock(&kvm
->srcu
, idx
);
417 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
418 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
419 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
420 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
421 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
422 .test_young
= kvm_mmu_notifier_test_young
,
423 .change_pte
= kvm_mmu_notifier_change_pte
,
424 .release
= kvm_mmu_notifier_release
,
427 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
429 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
430 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
433 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
435 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
440 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
442 static struct kvm_memslots
*kvm_alloc_memslots(void)
445 struct kvm_memslots
*slots
;
447 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
452 * Init kvm generation close to the maximum to easily test the
453 * code of handling generation number wrap-around.
455 slots
->generation
= -150;
456 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
457 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
462 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
464 if (!memslot
->dirty_bitmap
)
467 kvfree(memslot
->dirty_bitmap
);
468 memslot
->dirty_bitmap
= NULL
;
472 * Free any memory in @free but not in @dont.
474 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
475 struct kvm_memory_slot
*dont
)
477 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
478 kvm_destroy_dirty_bitmap(free
);
480 kvm_arch_free_memslot(kvm
, free
, dont
);
485 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
487 struct kvm_memory_slot
*memslot
;
492 kvm_for_each_memslot(memslot
, slots
)
493 kvm_free_memslot(kvm
, memslot
, NULL
);
498 static struct kvm
*kvm_create_vm(unsigned long type
)
501 struct kvm
*kvm
= kvm_arch_alloc_vm();
504 return ERR_PTR(-ENOMEM
);
506 r
= kvm_arch_init_vm(kvm
, type
);
508 goto out_err_no_disable
;
510 r
= hardware_enable_all();
512 goto out_err_no_disable
;
514 #ifdef CONFIG_HAVE_KVM_IRQFD
515 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
518 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
521 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
522 kvm
->memslots
[i
] = kvm_alloc_memslots();
523 if (!kvm
->memslots
[i
])
524 goto out_err_no_srcu
;
527 if (init_srcu_struct(&kvm
->srcu
))
528 goto out_err_no_srcu
;
529 if (init_srcu_struct(&kvm
->irq_srcu
))
530 goto out_err_no_irq_srcu
;
531 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
532 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
538 spin_lock_init(&kvm
->mmu_lock
);
539 kvm
->mm
= current
->mm
;
540 atomic_inc(&kvm
->mm
->mm_count
);
541 kvm_eventfd_init(kvm
);
542 mutex_init(&kvm
->lock
);
543 mutex_init(&kvm
->irq_lock
);
544 mutex_init(&kvm
->slots_lock
);
545 atomic_set(&kvm
->users_count
, 1);
546 INIT_LIST_HEAD(&kvm
->devices
);
548 r
= kvm_init_mmu_notifier(kvm
);
552 spin_lock(&kvm_lock
);
553 list_add(&kvm
->vm_list
, &vm_list
);
554 spin_unlock(&kvm_lock
);
559 cleanup_srcu_struct(&kvm
->irq_srcu
);
561 cleanup_srcu_struct(&kvm
->srcu
);
563 hardware_disable_all();
565 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
566 kfree(kvm
->buses
[i
]);
567 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
568 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
569 kvm_arch_free_vm(kvm
);
574 * Avoid using vmalloc for a small buffer.
575 * Should not be used when the size is statically known.
577 void *kvm_kvzalloc(unsigned long size
)
579 if (size
> PAGE_SIZE
)
580 return vzalloc(size
);
582 return kzalloc(size
, GFP_KERNEL
);
585 static void kvm_destroy_devices(struct kvm
*kvm
)
587 struct list_head
*node
, *tmp
;
589 list_for_each_safe(node
, tmp
, &kvm
->devices
) {
590 struct kvm_device
*dev
=
591 list_entry(node
, struct kvm_device
, vm_node
);
594 dev
->ops
->destroy(dev
);
598 static void kvm_destroy_vm(struct kvm
*kvm
)
601 struct mm_struct
*mm
= kvm
->mm
;
603 kvm_arch_sync_events(kvm
);
604 spin_lock(&kvm_lock
);
605 list_del(&kvm
->vm_list
);
606 spin_unlock(&kvm_lock
);
607 kvm_free_irq_routing(kvm
);
608 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
609 kvm_io_bus_destroy(kvm
->buses
[i
]);
610 kvm_coalesced_mmio_free(kvm
);
611 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
612 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
614 kvm_arch_flush_shadow_all(kvm
);
616 kvm_arch_destroy_vm(kvm
);
617 kvm_destroy_devices(kvm
);
618 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
619 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
620 cleanup_srcu_struct(&kvm
->irq_srcu
);
621 cleanup_srcu_struct(&kvm
->srcu
);
622 kvm_arch_free_vm(kvm
);
623 hardware_disable_all();
627 void kvm_get_kvm(struct kvm
*kvm
)
629 atomic_inc(&kvm
->users_count
);
631 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
633 void kvm_put_kvm(struct kvm
*kvm
)
635 if (atomic_dec_and_test(&kvm
->users_count
))
638 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
641 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
643 struct kvm
*kvm
= filp
->private_data
;
645 kvm_irqfd_release(kvm
);
652 * Allocation size is twice as large as the actual dirty bitmap size.
653 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
655 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
657 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
659 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
660 if (!memslot
->dirty_bitmap
)
667 * Insert memslot and re-sort memslots based on their GFN,
668 * so binary search could be used to lookup GFN.
669 * Sorting algorithm takes advantage of having initially
670 * sorted array and known changed memslot position.
672 static void update_memslots(struct kvm_memslots
*slots
,
673 struct kvm_memory_slot
*new)
676 int i
= slots
->id_to_index
[id
];
677 struct kvm_memory_slot
*mslots
= slots
->memslots
;
679 WARN_ON(mslots
[i
].id
!= id
);
681 WARN_ON(!mslots
[i
].npages
);
682 if (mslots
[i
].npages
)
685 if (!mslots
[i
].npages
)
689 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
690 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
691 if (!mslots
[i
+ 1].npages
)
693 mslots
[i
] = mslots
[i
+ 1];
694 slots
->id_to_index
[mslots
[i
].id
] = i
;
699 * The ">=" is needed when creating a slot with base_gfn == 0,
700 * so that it moves before all those with base_gfn == npages == 0.
702 * On the other hand, if new->npages is zero, the above loop has
703 * already left i pointing to the beginning of the empty part of
704 * mslots, and the ">=" would move the hole backwards in this
705 * case---which is wrong. So skip the loop when deleting a slot.
709 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
710 mslots
[i
] = mslots
[i
- 1];
711 slots
->id_to_index
[mslots
[i
].id
] = i
;
715 WARN_ON_ONCE(i
!= slots
->used_slots
);
718 slots
->id_to_index
[mslots
[i
].id
] = i
;
721 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
723 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
725 #ifdef __KVM_HAVE_READONLY_MEM
726 valid_flags
|= KVM_MEM_READONLY
;
729 if (mem
->flags
& ~valid_flags
)
735 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
736 int as_id
, struct kvm_memslots
*slots
)
738 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
741 * Set the low bit in the generation, which disables SPTE caching
742 * until the end of synchronize_srcu_expedited.
744 WARN_ON(old_memslots
->generation
& 1);
745 slots
->generation
= old_memslots
->generation
+ 1;
747 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
748 synchronize_srcu_expedited(&kvm
->srcu
);
751 * Increment the new memslot generation a second time. This prevents
752 * vm exits that race with memslot updates from caching a memslot
753 * generation that will (potentially) be valid forever.
757 kvm_arch_memslots_updated(kvm
, slots
);
763 * Allocate some memory and give it an address in the guest physical address
766 * Discontiguous memory is allowed, mostly for framebuffers.
768 * Must be called holding kvm->slots_lock for write.
770 int __kvm_set_memory_region(struct kvm
*kvm
,
771 const struct kvm_userspace_memory_region
*mem
)
775 unsigned long npages
;
776 struct kvm_memory_slot
*slot
;
777 struct kvm_memory_slot old
, new;
778 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
780 enum kvm_mr_change change
;
782 r
= check_memory_region_flags(mem
);
787 as_id
= mem
->slot
>> 16;
790 /* General sanity checks */
791 if (mem
->memory_size
& (PAGE_SIZE
- 1))
793 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
795 /* We can read the guest memory with __xxx_user() later on. */
796 if ((id
< KVM_USER_MEM_SLOTS
) &&
797 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
798 !access_ok(VERIFY_WRITE
,
799 (void __user
*)(unsigned long)mem
->userspace_addr
,
802 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
804 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
807 slot
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
808 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
809 npages
= mem
->memory_size
>> PAGE_SHIFT
;
811 if (npages
> KVM_MEM_MAX_NR_PAGES
)
817 new.base_gfn
= base_gfn
;
819 new.flags
= mem
->flags
;
823 change
= KVM_MR_CREATE
;
824 else { /* Modify an existing slot. */
825 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
826 (npages
!= old
.npages
) ||
827 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
830 if (base_gfn
!= old
.base_gfn
)
831 change
= KVM_MR_MOVE
;
832 else if (new.flags
!= old
.flags
)
833 change
= KVM_MR_FLAGS_ONLY
;
834 else { /* Nothing to change. */
843 change
= KVM_MR_DELETE
;
848 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
849 /* Check for overlaps */
851 kvm_for_each_memslot(slot
, __kvm_memslots(kvm
, as_id
)) {
852 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
855 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
856 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
861 /* Free page dirty bitmap if unneeded */
862 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
863 new.dirty_bitmap
= NULL
;
866 if (change
== KVM_MR_CREATE
) {
867 new.userspace_addr
= mem
->userspace_addr
;
869 if (kvm_arch_create_memslot(kvm
, &new, npages
))
873 /* Allocate page dirty bitmap if needed */
874 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
875 if (kvm_create_dirty_bitmap(&new) < 0)
879 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
882 memcpy(slots
, __kvm_memslots(kvm
, as_id
), sizeof(struct kvm_memslots
));
884 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
885 slot
= id_to_memslot(slots
, id
);
886 slot
->flags
|= KVM_MEMSLOT_INVALID
;
888 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
890 /* slot was deleted or moved, clear iommu mapping */
891 kvm_iommu_unmap_pages(kvm
, &old
);
892 /* From this point no new shadow pages pointing to a deleted,
893 * or moved, memslot will be created.
895 * validation of sp->gfn happens in:
896 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
897 * - kvm_is_visible_gfn (mmu_check_roots)
899 kvm_arch_flush_shadow_memslot(kvm
, slot
);
902 * We can re-use the old_memslots from above, the only difference
903 * from the currently installed memslots is the invalid flag. This
904 * will get overwritten by update_memslots anyway.
906 slots
= old_memslots
;
909 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
913 /* actual memory is freed via old in kvm_free_memslot below */
914 if (change
== KVM_MR_DELETE
) {
915 new.dirty_bitmap
= NULL
;
916 memset(&new.arch
, 0, sizeof(new.arch
));
919 update_memslots(slots
, &new);
920 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
922 kvm_arch_commit_memory_region(kvm
, mem
, &old
, &new, change
);
924 kvm_free_memslot(kvm
, &old
, &new);
925 kvfree(old_memslots
);
928 * IOMMU mapping: New slots need to be mapped. Old slots need to be
929 * un-mapped and re-mapped if their base changes. Since base change
930 * unmapping is handled above with slot deletion, mapping alone is
931 * needed here. Anything else the iommu might care about for existing
932 * slots (size changes, userspace addr changes and read-only flag
933 * changes) is disallowed above, so any other attribute changes getting
934 * here can be skipped.
936 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
937 r
= kvm_iommu_map_pages(kvm
, &new);
946 kvm_free_memslot(kvm
, &new, &old
);
950 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
952 int kvm_set_memory_region(struct kvm
*kvm
,
953 const struct kvm_userspace_memory_region
*mem
)
957 mutex_lock(&kvm
->slots_lock
);
958 r
= __kvm_set_memory_region(kvm
, mem
);
959 mutex_unlock(&kvm
->slots_lock
);
962 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
964 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
965 struct kvm_userspace_memory_region
*mem
)
967 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
970 return kvm_set_memory_region(kvm
, mem
);
973 int kvm_get_dirty_log(struct kvm
*kvm
,
974 struct kvm_dirty_log
*log
, int *is_dirty
)
976 struct kvm_memslots
*slots
;
977 struct kvm_memory_slot
*memslot
;
980 unsigned long any
= 0;
983 as_id
= log
->slot
>> 16;
985 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
988 slots
= __kvm_memslots(kvm
, as_id
);
989 memslot
= id_to_memslot(slots
, id
);
991 if (!memslot
->dirty_bitmap
)
994 n
= kvm_dirty_bitmap_bytes(memslot
);
996 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
997 any
= memslot
->dirty_bitmap
[i
];
1000 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1010 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1012 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1014 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1015 * are dirty write protect them for next write.
1016 * @kvm: pointer to kvm instance
1017 * @log: slot id and address to which we copy the log
1018 * @is_dirty: flag set if any page is dirty
1020 * We need to keep it in mind that VCPU threads can write to the bitmap
1021 * concurrently. So, to avoid losing track of dirty pages we keep the
1024 * 1. Take a snapshot of the bit and clear it if needed.
1025 * 2. Write protect the corresponding page.
1026 * 3. Copy the snapshot to the userspace.
1027 * 4. Upon return caller flushes TLB's if needed.
1029 * Between 2 and 4, the guest may write to the page using the remaining TLB
1030 * entry. This is not a problem because the page is reported dirty using
1031 * the snapshot taken before and step 4 ensures that writes done after
1032 * exiting to userspace will be logged for the next call.
1035 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1036 struct kvm_dirty_log
*log
, bool *is_dirty
)
1038 struct kvm_memslots
*slots
;
1039 struct kvm_memory_slot
*memslot
;
1040 int r
, i
, as_id
, id
;
1042 unsigned long *dirty_bitmap
;
1043 unsigned long *dirty_bitmap_buffer
;
1046 as_id
= log
->slot
>> 16;
1047 id
= (u16
)log
->slot
;
1048 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1051 slots
= __kvm_memslots(kvm
, as_id
);
1052 memslot
= id_to_memslot(slots
, id
);
1054 dirty_bitmap
= memslot
->dirty_bitmap
;
1059 n
= kvm_dirty_bitmap_bytes(memslot
);
1061 dirty_bitmap_buffer
= dirty_bitmap
+ n
/ sizeof(long);
1062 memset(dirty_bitmap_buffer
, 0, n
);
1064 spin_lock(&kvm
->mmu_lock
);
1066 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1070 if (!dirty_bitmap
[i
])
1075 mask
= xchg(&dirty_bitmap
[i
], 0);
1076 dirty_bitmap_buffer
[i
] = mask
;
1079 offset
= i
* BITS_PER_LONG
;
1080 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1085 spin_unlock(&kvm
->mmu_lock
);
1088 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1095 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1098 bool kvm_largepages_enabled(void)
1100 return largepages_enabled
;
1103 void kvm_disable_largepages(void)
1105 largepages_enabled
= false;
1107 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1109 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1111 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1113 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1115 struct kvm_memory_slot
*kvm_vcpu_gfn_to_memslot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1117 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu
), gfn
);
1120 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1122 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1124 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1125 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1130 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1132 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1134 struct vm_area_struct
*vma
;
1135 unsigned long addr
, size
;
1139 addr
= gfn_to_hva(kvm
, gfn
);
1140 if (kvm_is_error_hva(addr
))
1143 down_read(¤t
->mm
->mmap_sem
);
1144 vma
= find_vma(current
->mm
, addr
);
1148 size
= vma_kernel_pagesize(vma
);
1151 up_read(¤t
->mm
->mmap_sem
);
1156 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1158 return slot
->flags
& KVM_MEM_READONLY
;
1161 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1162 gfn_t
*nr_pages
, bool write
)
1164 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1165 return KVM_HVA_ERR_BAD
;
1167 if (memslot_is_readonly(slot
) && write
)
1168 return KVM_HVA_ERR_RO_BAD
;
1171 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1173 return __gfn_to_hva_memslot(slot
, gfn
);
1176 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1179 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1182 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1185 return gfn_to_hva_many(slot
, gfn
, NULL
);
1187 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1189 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1191 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1193 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1195 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1197 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1199 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1202 * If writable is set to false, the hva returned by this function is only
1203 * allowed to be read.
1205 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1206 gfn_t gfn
, bool *writable
)
1208 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1210 if (!kvm_is_error_hva(hva
) && writable
)
1211 *writable
= !memslot_is_readonly(slot
);
1216 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1218 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1220 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1223 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1225 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1227 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1230 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1231 unsigned long start
, int write
, struct page
**page
)
1233 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1236 flags
|= FOLL_WRITE
;
1238 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1241 static inline int check_user_page_hwpoison(unsigned long addr
)
1243 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1245 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1246 flags
, NULL
, NULL
, NULL
);
1247 return rc
== -EHWPOISON
;
1251 * The atomic path to get the writable pfn which will be stored in @pfn,
1252 * true indicates success, otherwise false is returned.
1254 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1255 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1257 struct page
*page
[1];
1260 if (!(async
|| atomic
))
1264 * Fast pin a writable pfn only if it is a write fault request
1265 * or the caller allows to map a writable pfn for a read fault
1268 if (!(write_fault
|| writable
))
1271 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1273 *pfn
= page_to_pfn(page
[0]);
1284 * The slow path to get the pfn of the specified host virtual address,
1285 * 1 indicates success, -errno is returned if error is detected.
1287 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1288 bool *writable
, pfn_t
*pfn
)
1290 struct page
*page
[1];
1296 *writable
= write_fault
;
1299 down_read(¤t
->mm
->mmap_sem
);
1300 npages
= get_user_page_nowait(current
, current
->mm
,
1301 addr
, write_fault
, page
);
1302 up_read(¤t
->mm
->mmap_sem
);
1304 npages
= __get_user_pages_unlocked(current
, current
->mm
, addr
, 1,
1305 write_fault
, 0, page
,
1306 FOLL_TOUCH
|FOLL_HWPOISON
);
1310 /* map read fault as writable if possible */
1311 if (unlikely(!write_fault
) && writable
) {
1312 struct page
*wpage
[1];
1314 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1323 *pfn
= page_to_pfn(page
[0]);
1327 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1329 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1332 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1339 * Pin guest page in memory and return its pfn.
1340 * @addr: host virtual address which maps memory to the guest
1341 * @atomic: whether this function can sleep
1342 * @async: whether this function need to wait IO complete if the
1343 * host page is not in the memory
1344 * @write_fault: whether we should get a writable host page
1345 * @writable: whether it allows to map a writable host page for !@write_fault
1347 * The function will map a writable host page for these two cases:
1348 * 1): @write_fault = true
1349 * 2): @write_fault = false && @writable, @writable will tell the caller
1350 * whether the mapping is writable.
1352 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1353 bool write_fault
, bool *writable
)
1355 struct vm_area_struct
*vma
;
1359 /* we can do it either atomically or asynchronously, not both */
1360 BUG_ON(atomic
&& async
);
1362 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1366 return KVM_PFN_ERR_FAULT
;
1368 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1372 down_read(¤t
->mm
->mmap_sem
);
1373 if (npages
== -EHWPOISON
||
1374 (!async
&& check_user_page_hwpoison(addr
))) {
1375 pfn
= KVM_PFN_ERR_HWPOISON
;
1379 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1382 pfn
= KVM_PFN_ERR_FAULT
;
1383 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1384 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1386 BUG_ON(!kvm_is_reserved_pfn(pfn
));
1388 if (async
&& vma_is_valid(vma
, write_fault
))
1390 pfn
= KVM_PFN_ERR_FAULT
;
1393 up_read(¤t
->mm
->mmap_sem
);
1397 pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1398 bool *async
, bool write_fault
, bool *writable
)
1400 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1402 if (addr
== KVM_HVA_ERR_RO_BAD
)
1403 return KVM_PFN_ERR_RO_FAULT
;
1405 if (kvm_is_error_hva(addr
))
1406 return KVM_PFN_NOSLOT
;
1408 /* Do not map writable pfn in the readonly memslot. */
1409 if (writable
&& memslot_is_readonly(slot
)) {
1414 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1417 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1419 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1422 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1423 write_fault
, writable
);
1425 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1427 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1429 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1431 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1433 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1435 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1437 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1439 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1441 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm
, gfn
), gfn
);
1443 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1445 pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1447 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1449 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1451 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1453 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1455 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1457 pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1459 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1461 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1463 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1464 struct page
**pages
, int nr_pages
)
1469 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1470 if (kvm_is_error_hva(addr
))
1473 if (entry
< nr_pages
)
1476 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1478 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1480 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1482 if (is_error_noslot_pfn(pfn
))
1483 return KVM_ERR_PTR_BAD_PAGE
;
1485 if (kvm_is_reserved_pfn(pfn
)) {
1487 return KVM_ERR_PTR_BAD_PAGE
;
1490 return pfn_to_page(pfn
);
1493 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1497 pfn
= gfn_to_pfn(kvm
, gfn
);
1499 return kvm_pfn_to_page(pfn
);
1501 EXPORT_SYMBOL_GPL(gfn_to_page
);
1503 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1507 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
1509 return kvm_pfn_to_page(pfn
);
1511 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
1513 void kvm_release_page_clean(struct page
*page
)
1515 WARN_ON(is_error_page(page
));
1517 kvm_release_pfn_clean(page_to_pfn(page
));
1519 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1521 void kvm_release_pfn_clean(pfn_t pfn
)
1523 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1524 put_page(pfn_to_page(pfn
));
1526 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1528 void kvm_release_page_dirty(struct page
*page
)
1530 WARN_ON(is_error_page(page
));
1532 kvm_release_pfn_dirty(page_to_pfn(page
));
1534 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1536 static void kvm_release_pfn_dirty(pfn_t pfn
)
1538 kvm_set_pfn_dirty(pfn
);
1539 kvm_release_pfn_clean(pfn
);
1542 void kvm_set_pfn_dirty(pfn_t pfn
)
1544 if (!kvm_is_reserved_pfn(pfn
)) {
1545 struct page
*page
= pfn_to_page(pfn
);
1547 if (!PageReserved(page
))
1551 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1553 void kvm_set_pfn_accessed(pfn_t pfn
)
1555 if (!kvm_is_reserved_pfn(pfn
))
1556 mark_page_accessed(pfn_to_page(pfn
));
1558 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1560 void kvm_get_pfn(pfn_t pfn
)
1562 if (!kvm_is_reserved_pfn(pfn
))
1563 get_page(pfn_to_page(pfn
));
1565 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1567 static int next_segment(unsigned long len
, int offset
)
1569 if (len
> PAGE_SIZE
- offset
)
1570 return PAGE_SIZE
- offset
;
1575 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1576 void *data
, int offset
, int len
)
1581 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1582 if (kvm_is_error_hva(addr
))
1584 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1590 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1593 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1595 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1597 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1599 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
1600 int offset
, int len
)
1602 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1604 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1606 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
1608 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1610 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1612 int offset
= offset_in_page(gpa
);
1615 while ((seg
= next_segment(len
, offset
)) != 0) {
1616 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1626 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1628 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
1630 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1632 int offset
= offset_in_page(gpa
);
1635 while ((seg
= next_segment(len
, offset
)) != 0) {
1636 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1646 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
1648 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1649 void *data
, int offset
, unsigned long len
)
1654 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1655 if (kvm_is_error_hva(addr
))
1657 pagefault_disable();
1658 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1665 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1668 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1669 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1670 int offset
= offset_in_page(gpa
);
1672 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1674 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic
);
1676 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
1677 void *data
, unsigned long len
)
1679 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1680 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1681 int offset
= offset_in_page(gpa
);
1683 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1685 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
1687 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
1688 const void *data
, int offset
, int len
)
1693 addr
= gfn_to_hva_memslot(memslot
, gfn
);
1694 if (kvm_is_error_hva(addr
))
1696 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1699 mark_page_dirty_in_slot(memslot
, gfn
);
1703 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
1704 const void *data
, int offset
, int len
)
1706 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1708 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1710 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1712 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
1713 const void *data
, int offset
, int len
)
1715 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1717 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1719 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
1721 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1724 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1726 int offset
= offset_in_page(gpa
);
1729 while ((seg
= next_segment(len
, offset
)) != 0) {
1730 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1740 EXPORT_SYMBOL_GPL(kvm_write_guest
);
1742 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
1745 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1747 int offset
= offset_in_page(gpa
);
1750 while ((seg
= next_segment(len
, offset
)) != 0) {
1751 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1761 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
1763 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1764 gpa_t gpa
, unsigned long len
)
1766 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1767 int offset
= offset_in_page(gpa
);
1768 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1769 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1770 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1771 gfn_t nr_pages_avail
;
1774 ghc
->generation
= slots
->generation
;
1776 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1777 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, NULL
);
1778 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_needed
<= 1) {
1782 * If the requested region crosses two memslots, we still
1783 * verify that the entire region is valid here.
1785 while (start_gfn
<= end_gfn
) {
1786 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1787 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1789 if (kvm_is_error_hva(ghc
->hva
))
1791 start_gfn
+= nr_pages_avail
;
1793 /* Use the slow path for cross page reads and writes. */
1794 ghc
->memslot
= NULL
;
1798 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1800 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1801 void *data
, unsigned long len
)
1803 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1806 BUG_ON(len
> ghc
->len
);
1808 if (slots
->generation
!= ghc
->generation
)
1809 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1811 if (unlikely(!ghc
->memslot
))
1812 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1814 if (kvm_is_error_hva(ghc
->hva
))
1817 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1820 mark_page_dirty_in_slot(ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1824 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1826 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1827 void *data
, unsigned long len
)
1829 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1832 BUG_ON(len
> ghc
->len
);
1834 if (slots
->generation
!= ghc
->generation
)
1835 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1837 if (unlikely(!ghc
->memslot
))
1838 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1840 if (kvm_is_error_hva(ghc
->hva
))
1843 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1849 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1851 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1853 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1855 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
1857 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1859 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1861 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1863 int offset
= offset_in_page(gpa
);
1866 while ((seg
= next_segment(len
, offset
)) != 0) {
1867 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1876 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1878 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
1881 if (memslot
&& memslot
->dirty_bitmap
) {
1882 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1884 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1888 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1890 struct kvm_memory_slot
*memslot
;
1892 memslot
= gfn_to_memslot(kvm
, gfn
);
1893 mark_page_dirty_in_slot(memslot
, gfn
);
1895 EXPORT_SYMBOL_GPL(mark_page_dirty
);
1897 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1899 struct kvm_memory_slot
*memslot
;
1901 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1902 mark_page_dirty_in_slot(memslot
, gfn
);
1904 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
1906 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
1908 if (kvm_arch_vcpu_runnable(vcpu
)) {
1909 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1912 if (kvm_cpu_has_pending_timer(vcpu
))
1914 if (signal_pending(current
))
1921 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1923 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1927 bool waited
= false;
1929 start
= cur
= ktime_get();
1931 ktime_t stop
= ktime_add_ns(ktime_get(), halt_poll_ns
);
1935 * This sets KVM_REQ_UNHALT if an interrupt
1938 if (kvm_vcpu_check_block(vcpu
) < 0) {
1939 ++vcpu
->stat
.halt_successful_poll
;
1943 } while (single_task_running() && ktime_before(cur
, stop
));
1947 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1949 if (kvm_vcpu_check_block(vcpu
) < 0)
1956 finish_wait(&vcpu
->wq
, &wait
);
1960 trace_kvm_vcpu_wakeup(ktime_to_ns(cur
) - ktime_to_ns(start
), waited
);
1962 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
1966 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1968 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1971 int cpu
= vcpu
->cpu
;
1972 wait_queue_head_t
*wqp
;
1974 wqp
= kvm_arch_vcpu_wq(vcpu
);
1975 if (waitqueue_active(wqp
)) {
1976 wake_up_interruptible(wqp
);
1977 ++vcpu
->stat
.halt_wakeup
;
1981 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1982 if (kvm_arch_vcpu_should_kick(vcpu
))
1983 smp_send_reschedule(cpu
);
1986 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
1987 #endif /* !CONFIG_S390 */
1989 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1992 struct task_struct
*task
= NULL
;
1996 pid
= rcu_dereference(target
->pid
);
1998 task
= get_pid_task(pid
, PIDTYPE_PID
);
2002 ret
= yield_to(task
, 1);
2003 put_task_struct(task
);
2007 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2010 * Helper that checks whether a VCPU is eligible for directed yield.
2011 * Most eligible candidate to yield is decided by following heuristics:
2013 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2014 * (preempted lock holder), indicated by @in_spin_loop.
2015 * Set at the beiginning and cleared at the end of interception/PLE handler.
2017 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2018 * chance last time (mostly it has become eligible now since we have probably
2019 * yielded to lockholder in last iteration. This is done by toggling
2020 * @dy_eligible each time a VCPU checked for eligibility.)
2022 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2023 * to preempted lock-holder could result in wrong VCPU selection and CPU
2024 * burning. Giving priority for a potential lock-holder increases lock
2027 * Since algorithm is based on heuristics, accessing another VCPU data without
2028 * locking does not harm. It may result in trying to yield to same VCPU, fail
2029 * and continue with next VCPU and so on.
2031 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2033 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2036 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2037 vcpu
->spin_loop
.dy_eligible
;
2039 if (vcpu
->spin_loop
.in_spin_loop
)
2040 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2048 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
2050 struct kvm
*kvm
= me
->kvm
;
2051 struct kvm_vcpu
*vcpu
;
2052 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2058 kvm_vcpu_set_in_spin_loop(me
, true);
2060 * We boost the priority of a VCPU that is runnable but not
2061 * currently running, because it got preempted by something
2062 * else and called schedule in __vcpu_run. Hopefully that
2063 * VCPU is holding the lock that we need and will release it.
2064 * We approximate round-robin by starting at the last boosted VCPU.
2066 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2067 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2068 if (!pass
&& i
<= last_boosted_vcpu
) {
2069 i
= last_boosted_vcpu
;
2071 } else if (pass
&& i
> last_boosted_vcpu
)
2073 if (!ACCESS_ONCE(vcpu
->preempted
))
2077 if (waitqueue_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
2079 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2082 yielded
= kvm_vcpu_yield_to(vcpu
);
2084 kvm
->last_boosted_vcpu
= i
;
2086 } else if (yielded
< 0) {
2093 kvm_vcpu_set_in_spin_loop(me
, false);
2095 /* Ensure vcpu is not eligible during next spinloop */
2096 kvm_vcpu_set_dy_eligible(me
, false);
2098 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2100 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2102 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
2105 if (vmf
->pgoff
== 0)
2106 page
= virt_to_page(vcpu
->run
);
2108 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2109 page
= virt_to_page(vcpu
->arch
.pio_data
);
2111 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2112 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2113 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2116 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2122 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2123 .fault
= kvm_vcpu_fault
,
2126 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2128 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2132 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2134 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2136 kvm_put_kvm(vcpu
->kvm
);
2140 static struct file_operations kvm_vcpu_fops
= {
2141 .release
= kvm_vcpu_release
,
2142 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2143 #ifdef CONFIG_KVM_COMPAT
2144 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
2146 .mmap
= kvm_vcpu_mmap
,
2147 .llseek
= noop_llseek
,
2151 * Allocates an inode for the vcpu.
2153 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2155 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2159 * Creates some virtual cpus. Good luck creating more than one.
2161 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2164 struct kvm_vcpu
*vcpu
, *v
;
2166 if (id
>= KVM_MAX_VCPUS
)
2169 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2171 return PTR_ERR(vcpu
);
2173 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2175 r
= kvm_arch_vcpu_setup(vcpu
);
2179 mutex_lock(&kvm
->lock
);
2180 if (!kvm_vcpu_compatible(vcpu
)) {
2182 goto unlock_vcpu_destroy
;
2184 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
2186 goto unlock_vcpu_destroy
;
2189 kvm_for_each_vcpu(r
, v
, kvm
)
2190 if (v
->vcpu_id
== id
) {
2192 goto unlock_vcpu_destroy
;
2195 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2197 /* Now it's all set up, let userspace reach it */
2199 r
= create_vcpu_fd(vcpu
);
2202 goto unlock_vcpu_destroy
;
2205 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2207 atomic_inc(&kvm
->online_vcpus
);
2209 mutex_unlock(&kvm
->lock
);
2210 kvm_arch_vcpu_postcreate(vcpu
);
2213 unlock_vcpu_destroy
:
2214 mutex_unlock(&kvm
->lock
);
2216 kvm_arch_vcpu_destroy(vcpu
);
2220 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2223 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2224 vcpu
->sigset_active
= 1;
2225 vcpu
->sigset
= *sigset
;
2227 vcpu
->sigset_active
= 0;
2231 static long kvm_vcpu_ioctl(struct file
*filp
,
2232 unsigned int ioctl
, unsigned long arg
)
2234 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2235 void __user
*argp
= (void __user
*)arg
;
2237 struct kvm_fpu
*fpu
= NULL
;
2238 struct kvm_sregs
*kvm_sregs
= NULL
;
2240 if (vcpu
->kvm
->mm
!= current
->mm
)
2243 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2246 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2248 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2249 * so vcpu_load() would break it.
2251 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_S390_IRQ
|| ioctl
== KVM_INTERRUPT
)
2252 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2256 r
= vcpu_load(vcpu
);
2264 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
2265 /* The thread running this VCPU changed. */
2266 struct pid
*oldpid
= vcpu
->pid
;
2267 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
2269 rcu_assign_pointer(vcpu
->pid
, newpid
);
2274 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2275 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2277 case KVM_GET_REGS
: {
2278 struct kvm_regs
*kvm_regs
;
2281 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2284 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2288 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2295 case KVM_SET_REGS
: {
2296 struct kvm_regs
*kvm_regs
;
2299 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2300 if (IS_ERR(kvm_regs
)) {
2301 r
= PTR_ERR(kvm_regs
);
2304 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2308 case KVM_GET_SREGS
: {
2309 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2313 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2317 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2322 case KVM_SET_SREGS
: {
2323 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2324 if (IS_ERR(kvm_sregs
)) {
2325 r
= PTR_ERR(kvm_sregs
);
2329 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2332 case KVM_GET_MP_STATE
: {
2333 struct kvm_mp_state mp_state
;
2335 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2339 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2344 case KVM_SET_MP_STATE
: {
2345 struct kvm_mp_state mp_state
;
2348 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2350 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2353 case KVM_TRANSLATE
: {
2354 struct kvm_translation tr
;
2357 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2359 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2363 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2368 case KVM_SET_GUEST_DEBUG
: {
2369 struct kvm_guest_debug dbg
;
2372 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2374 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2377 case KVM_SET_SIGNAL_MASK
: {
2378 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2379 struct kvm_signal_mask kvm_sigmask
;
2380 sigset_t sigset
, *p
;
2385 if (copy_from_user(&kvm_sigmask
, argp
,
2386 sizeof(kvm_sigmask
)))
2389 if (kvm_sigmask
.len
!= sizeof(sigset
))
2392 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2397 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2401 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2405 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2409 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2415 fpu
= memdup_user(argp
, sizeof(*fpu
));
2421 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2425 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2434 #ifdef CONFIG_KVM_COMPAT
2435 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2436 unsigned int ioctl
, unsigned long arg
)
2438 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2439 void __user
*argp
= compat_ptr(arg
);
2442 if (vcpu
->kvm
->mm
!= current
->mm
)
2446 case KVM_SET_SIGNAL_MASK
: {
2447 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2448 struct kvm_signal_mask kvm_sigmask
;
2449 compat_sigset_t csigset
;
2454 if (copy_from_user(&kvm_sigmask
, argp
,
2455 sizeof(kvm_sigmask
)))
2458 if (kvm_sigmask
.len
!= sizeof(csigset
))
2461 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2464 sigset_from_compat(&sigset
, &csigset
);
2465 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2467 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2471 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2479 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2480 int (*accessor
)(struct kvm_device
*dev
,
2481 struct kvm_device_attr
*attr
),
2484 struct kvm_device_attr attr
;
2489 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2492 return accessor(dev
, &attr
);
2495 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2498 struct kvm_device
*dev
= filp
->private_data
;
2501 case KVM_SET_DEVICE_ATTR
:
2502 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2503 case KVM_GET_DEVICE_ATTR
:
2504 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2505 case KVM_HAS_DEVICE_ATTR
:
2506 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2508 if (dev
->ops
->ioctl
)
2509 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2515 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2517 struct kvm_device
*dev
= filp
->private_data
;
2518 struct kvm
*kvm
= dev
->kvm
;
2524 static const struct file_operations kvm_device_fops
= {
2525 .unlocked_ioctl
= kvm_device_ioctl
,
2526 #ifdef CONFIG_KVM_COMPAT
2527 .compat_ioctl
= kvm_device_ioctl
,
2529 .release
= kvm_device_release
,
2532 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2534 if (filp
->f_op
!= &kvm_device_fops
)
2537 return filp
->private_data
;
2540 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2541 #ifdef CONFIG_KVM_MPIC
2542 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2543 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2546 #ifdef CONFIG_KVM_XICS
2547 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2551 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2553 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2556 if (kvm_device_ops_table
[type
] != NULL
)
2559 kvm_device_ops_table
[type
] = ops
;
2563 void kvm_unregister_device_ops(u32 type
)
2565 if (kvm_device_ops_table
[type
] != NULL
)
2566 kvm_device_ops_table
[type
] = NULL
;
2569 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2570 struct kvm_create_device
*cd
)
2572 struct kvm_device_ops
*ops
= NULL
;
2573 struct kvm_device
*dev
;
2574 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2577 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2580 ops
= kvm_device_ops_table
[cd
->type
];
2587 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2594 ret
= ops
->create(dev
, cd
->type
);
2600 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2606 list_add(&dev
->vm_node
, &kvm
->devices
);
2612 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2615 case KVM_CAP_USER_MEMORY
:
2616 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2617 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2618 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2619 case KVM_CAP_SET_BOOT_CPU_ID
:
2621 case KVM_CAP_INTERNAL_ERROR_DATA
:
2622 #ifdef CONFIG_HAVE_KVM_MSI
2623 case KVM_CAP_SIGNAL_MSI
:
2625 #ifdef CONFIG_HAVE_KVM_IRQFD
2627 case KVM_CAP_IRQFD_RESAMPLE
:
2629 case KVM_CAP_CHECK_EXTENSION_VM
:
2631 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2632 case KVM_CAP_IRQ_ROUTING
:
2633 return KVM_MAX_IRQ_ROUTES
;
2635 #if KVM_ADDRESS_SPACE_NUM > 1
2636 case KVM_CAP_MULTI_ADDRESS_SPACE
:
2637 return KVM_ADDRESS_SPACE_NUM
;
2642 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2645 static long kvm_vm_ioctl(struct file
*filp
,
2646 unsigned int ioctl
, unsigned long arg
)
2648 struct kvm
*kvm
= filp
->private_data
;
2649 void __user
*argp
= (void __user
*)arg
;
2652 if (kvm
->mm
!= current
->mm
)
2655 case KVM_CREATE_VCPU
:
2656 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2658 case KVM_SET_USER_MEMORY_REGION
: {
2659 struct kvm_userspace_memory_region kvm_userspace_mem
;
2662 if (copy_from_user(&kvm_userspace_mem
, argp
,
2663 sizeof(kvm_userspace_mem
)))
2666 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2669 case KVM_GET_DIRTY_LOG
: {
2670 struct kvm_dirty_log log
;
2673 if (copy_from_user(&log
, argp
, sizeof(log
)))
2675 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2678 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2679 case KVM_REGISTER_COALESCED_MMIO
: {
2680 struct kvm_coalesced_mmio_zone zone
;
2683 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2685 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2688 case KVM_UNREGISTER_COALESCED_MMIO
: {
2689 struct kvm_coalesced_mmio_zone zone
;
2692 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2694 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2699 struct kvm_irqfd data
;
2702 if (copy_from_user(&data
, argp
, sizeof(data
)))
2704 r
= kvm_irqfd(kvm
, &data
);
2707 case KVM_IOEVENTFD
: {
2708 struct kvm_ioeventfd data
;
2711 if (copy_from_user(&data
, argp
, sizeof(data
)))
2713 r
= kvm_ioeventfd(kvm
, &data
);
2716 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2717 case KVM_SET_BOOT_CPU_ID
:
2719 mutex_lock(&kvm
->lock
);
2720 if (atomic_read(&kvm
->online_vcpus
) != 0)
2723 kvm
->bsp_vcpu_id
= arg
;
2724 mutex_unlock(&kvm
->lock
);
2727 #ifdef CONFIG_HAVE_KVM_MSI
2728 case KVM_SIGNAL_MSI
: {
2732 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
2734 r
= kvm_send_userspace_msi(kvm
, &msi
);
2738 #ifdef __KVM_HAVE_IRQ_LINE
2739 case KVM_IRQ_LINE_STATUS
:
2740 case KVM_IRQ_LINE
: {
2741 struct kvm_irq_level irq_event
;
2744 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
2747 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2748 ioctl
== KVM_IRQ_LINE_STATUS
);
2753 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2754 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
2762 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2763 case KVM_SET_GSI_ROUTING
: {
2764 struct kvm_irq_routing routing
;
2765 struct kvm_irq_routing __user
*urouting
;
2766 struct kvm_irq_routing_entry
*entries
;
2769 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2772 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2777 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2782 if (copy_from_user(entries
, urouting
->entries
,
2783 routing
.nr
* sizeof(*entries
)))
2784 goto out_free_irq_routing
;
2785 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2787 out_free_irq_routing
:
2791 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2792 case KVM_CREATE_DEVICE
: {
2793 struct kvm_create_device cd
;
2796 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2799 r
= kvm_ioctl_create_device(kvm
, &cd
);
2804 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2810 case KVM_CHECK_EXTENSION
:
2811 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
2814 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2820 #ifdef CONFIG_KVM_COMPAT
2821 struct compat_kvm_dirty_log
{
2825 compat_uptr_t dirty_bitmap
; /* one bit per page */
2830 static long kvm_vm_compat_ioctl(struct file
*filp
,
2831 unsigned int ioctl
, unsigned long arg
)
2833 struct kvm
*kvm
= filp
->private_data
;
2836 if (kvm
->mm
!= current
->mm
)
2839 case KVM_GET_DIRTY_LOG
: {
2840 struct compat_kvm_dirty_log compat_log
;
2841 struct kvm_dirty_log log
;
2844 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2845 sizeof(compat_log
)))
2847 log
.slot
= compat_log
.slot
;
2848 log
.padding1
= compat_log
.padding1
;
2849 log
.padding2
= compat_log
.padding2
;
2850 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2852 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2856 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2864 static struct file_operations kvm_vm_fops
= {
2865 .release
= kvm_vm_release
,
2866 .unlocked_ioctl
= kvm_vm_ioctl
,
2867 #ifdef CONFIG_KVM_COMPAT
2868 .compat_ioctl
= kvm_vm_compat_ioctl
,
2870 .llseek
= noop_llseek
,
2873 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2878 kvm
= kvm_create_vm(type
);
2880 return PTR_ERR(kvm
);
2881 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2882 r
= kvm_coalesced_mmio_init(kvm
);
2888 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2895 static long kvm_dev_ioctl(struct file
*filp
,
2896 unsigned int ioctl
, unsigned long arg
)
2901 case KVM_GET_API_VERSION
:
2904 r
= KVM_API_VERSION
;
2907 r
= kvm_dev_ioctl_create_vm(arg
);
2909 case KVM_CHECK_EXTENSION
:
2910 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
2912 case KVM_GET_VCPU_MMAP_SIZE
:
2915 r
= PAGE_SIZE
; /* struct kvm_run */
2917 r
+= PAGE_SIZE
; /* pio data page */
2919 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2920 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2923 case KVM_TRACE_ENABLE
:
2924 case KVM_TRACE_PAUSE
:
2925 case KVM_TRACE_DISABLE
:
2929 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2935 static struct file_operations kvm_chardev_ops
= {
2936 .unlocked_ioctl
= kvm_dev_ioctl
,
2937 .compat_ioctl
= kvm_dev_ioctl
,
2938 .llseek
= noop_llseek
,
2941 static struct miscdevice kvm_dev
= {
2947 static void hardware_enable_nolock(void *junk
)
2949 int cpu
= raw_smp_processor_id();
2952 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2955 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2957 r
= kvm_arch_hardware_enable();
2960 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2961 atomic_inc(&hardware_enable_failed
);
2962 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
2966 static void hardware_enable(void)
2968 raw_spin_lock(&kvm_count_lock
);
2969 if (kvm_usage_count
)
2970 hardware_enable_nolock(NULL
);
2971 raw_spin_unlock(&kvm_count_lock
);
2974 static void hardware_disable_nolock(void *junk
)
2976 int cpu
= raw_smp_processor_id();
2978 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2980 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2981 kvm_arch_hardware_disable();
2984 static void hardware_disable(void)
2986 raw_spin_lock(&kvm_count_lock
);
2987 if (kvm_usage_count
)
2988 hardware_disable_nolock(NULL
);
2989 raw_spin_unlock(&kvm_count_lock
);
2992 static void hardware_disable_all_nolock(void)
2994 BUG_ON(!kvm_usage_count
);
2997 if (!kvm_usage_count
)
2998 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3001 static void hardware_disable_all(void)
3003 raw_spin_lock(&kvm_count_lock
);
3004 hardware_disable_all_nolock();
3005 raw_spin_unlock(&kvm_count_lock
);
3008 static int hardware_enable_all(void)
3012 raw_spin_lock(&kvm_count_lock
);
3015 if (kvm_usage_count
== 1) {
3016 atomic_set(&hardware_enable_failed
, 0);
3017 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3019 if (atomic_read(&hardware_enable_failed
)) {
3020 hardware_disable_all_nolock();
3025 raw_spin_unlock(&kvm_count_lock
);
3030 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
3033 val
&= ~CPU_TASKS_FROZEN
;
3045 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
3049 * Some (well, at least mine) BIOSes hang on reboot if
3052 * And Intel TXT required VMX off for all cpu when system shutdown.
3054 pr_info("kvm: exiting hardware virtualization\n");
3055 kvm_rebooting
= true;
3056 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3060 static struct notifier_block kvm_reboot_notifier
= {
3061 .notifier_call
= kvm_reboot
,
3065 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
3069 for (i
= 0; i
< bus
->dev_count
; i
++) {
3070 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
3072 kvm_iodevice_destructor(pos
);
3077 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
3078 const struct kvm_io_range
*r2
)
3080 if (r1
->addr
< r2
->addr
)
3082 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
3087 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
3089 return kvm_io_bus_cmp(p1
, p2
);
3092 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
3093 gpa_t addr
, int len
)
3095 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
3101 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
3102 kvm_io_bus_sort_cmp
, NULL
);
3107 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
3108 gpa_t addr
, int len
)
3110 struct kvm_io_range
*range
, key
;
3113 key
= (struct kvm_io_range
) {
3118 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
3119 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
3123 off
= range
- bus
->range
;
3125 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3131 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3132 struct kvm_io_range
*range
, const void *val
)
3136 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3140 while (idx
< bus
->dev_count
&&
3141 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3142 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3151 /* kvm_io_bus_write - called under kvm->slots_lock */
3152 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3153 int len
, const void *val
)
3155 struct kvm_io_bus
*bus
;
3156 struct kvm_io_range range
;
3159 range
= (struct kvm_io_range
) {
3164 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3165 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3166 return r
< 0 ? r
: 0;
3169 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3170 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3171 gpa_t addr
, int len
, const void *val
, long cookie
)
3173 struct kvm_io_bus
*bus
;
3174 struct kvm_io_range range
;
3176 range
= (struct kvm_io_range
) {
3181 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3183 /* First try the device referenced by cookie. */
3184 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3185 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3186 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3191 * cookie contained garbage; fall back to search and return the
3192 * correct cookie value.
3194 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3197 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3198 struct kvm_io_range
*range
, void *val
)
3202 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3206 while (idx
< bus
->dev_count
&&
3207 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3208 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3216 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3218 /* kvm_io_bus_read - called under kvm->slots_lock */
3219 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3222 struct kvm_io_bus
*bus
;
3223 struct kvm_io_range range
;
3226 range
= (struct kvm_io_range
) {
3231 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3232 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3233 return r
< 0 ? r
: 0;
3237 /* Caller must hold slots_lock. */
3238 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3239 int len
, struct kvm_io_device
*dev
)
3241 struct kvm_io_bus
*new_bus
, *bus
;
3243 bus
= kvm
->buses
[bus_idx
];
3244 /* exclude ioeventfd which is limited by maximum fd */
3245 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3248 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3249 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3252 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3253 sizeof(struct kvm_io_range
)));
3254 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3255 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3256 synchronize_srcu_expedited(&kvm
->srcu
);
3262 /* Caller must hold slots_lock. */
3263 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3264 struct kvm_io_device
*dev
)
3267 struct kvm_io_bus
*new_bus
, *bus
;
3269 bus
= kvm
->buses
[bus_idx
];
3271 for (i
= 0; i
< bus
->dev_count
; i
++)
3272 if (bus
->range
[i
].dev
== dev
) {
3280 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3281 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3285 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3286 new_bus
->dev_count
--;
3287 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3288 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3290 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3291 synchronize_srcu_expedited(&kvm
->srcu
);
3296 static struct notifier_block kvm_cpu_notifier
= {
3297 .notifier_call
= kvm_cpu_hotplug
,
3300 static int vm_stat_get(void *_offset
, u64
*val
)
3302 unsigned offset
= (long)_offset
;
3306 spin_lock(&kvm_lock
);
3307 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3308 *val
+= *(u32
*)((void *)kvm
+ offset
);
3309 spin_unlock(&kvm_lock
);
3313 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3315 static int vcpu_stat_get(void *_offset
, u64
*val
)
3317 unsigned offset
= (long)_offset
;
3319 struct kvm_vcpu
*vcpu
;
3323 spin_lock(&kvm_lock
);
3324 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3325 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3326 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3328 spin_unlock(&kvm_lock
);
3332 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3334 static const struct file_operations
*stat_fops
[] = {
3335 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3336 [KVM_STAT_VM
] = &vm_stat_fops
,
3339 static int kvm_init_debug(void)
3342 struct kvm_stats_debugfs_item
*p
;
3344 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3345 if (kvm_debugfs_dir
== NULL
)
3348 for (p
= debugfs_entries
; p
->name
; ++p
) {
3349 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3350 (void *)(long)p
->offset
,
3351 stat_fops
[p
->kind
]);
3352 if (p
->dentry
== NULL
)
3359 debugfs_remove_recursive(kvm_debugfs_dir
);
3364 static void kvm_exit_debug(void)
3366 struct kvm_stats_debugfs_item
*p
;
3368 for (p
= debugfs_entries
; p
->name
; ++p
)
3369 debugfs_remove(p
->dentry
);
3370 debugfs_remove(kvm_debugfs_dir
);
3373 static int kvm_suspend(void)
3375 if (kvm_usage_count
)
3376 hardware_disable_nolock(NULL
);
3380 static void kvm_resume(void)
3382 if (kvm_usage_count
) {
3383 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3384 hardware_enable_nolock(NULL
);
3388 static struct syscore_ops kvm_syscore_ops
= {
3389 .suspend
= kvm_suspend
,
3390 .resume
= kvm_resume
,
3394 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3396 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3399 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3401 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3403 if (vcpu
->preempted
)
3404 vcpu
->preempted
= false;
3406 kvm_arch_sched_in(vcpu
, cpu
);
3408 kvm_arch_vcpu_load(vcpu
, cpu
);
3411 static void kvm_sched_out(struct preempt_notifier
*pn
,
3412 struct task_struct
*next
)
3414 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3416 if (current
->state
== TASK_RUNNING
)
3417 vcpu
->preempted
= true;
3418 kvm_arch_vcpu_put(vcpu
);
3421 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3422 struct module
*module
)
3427 r
= kvm_arch_init(opaque
);
3432 * kvm_arch_init makes sure there's at most one caller
3433 * for architectures that support multiple implementations,
3434 * like intel and amd on x86.
3435 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3436 * conflicts in case kvm is already setup for another implementation.
3438 r
= kvm_irqfd_init();
3442 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3447 r
= kvm_arch_hardware_setup();
3451 for_each_online_cpu(cpu
) {
3452 smp_call_function_single(cpu
,
3453 kvm_arch_check_processor_compat
,
3459 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3462 register_reboot_notifier(&kvm_reboot_notifier
);
3464 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3466 vcpu_align
= __alignof__(struct kvm_vcpu
);
3467 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3469 if (!kvm_vcpu_cache
) {
3474 r
= kvm_async_pf_init();
3478 kvm_chardev_ops
.owner
= module
;
3479 kvm_vm_fops
.owner
= module
;
3480 kvm_vcpu_fops
.owner
= module
;
3482 r
= misc_register(&kvm_dev
);
3484 pr_err("kvm: misc device register failed\n");
3488 register_syscore_ops(&kvm_syscore_ops
);
3490 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3491 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3493 r
= kvm_init_debug();
3495 pr_err("kvm: create debugfs files failed\n");
3499 r
= kvm_vfio_ops_init();
3505 unregister_syscore_ops(&kvm_syscore_ops
);
3506 misc_deregister(&kvm_dev
);
3508 kvm_async_pf_deinit();
3510 kmem_cache_destroy(kvm_vcpu_cache
);
3512 unregister_reboot_notifier(&kvm_reboot_notifier
);
3513 unregister_cpu_notifier(&kvm_cpu_notifier
);
3516 kvm_arch_hardware_unsetup();
3518 free_cpumask_var(cpus_hardware_enabled
);
3526 EXPORT_SYMBOL_GPL(kvm_init
);
3531 misc_deregister(&kvm_dev
);
3532 kmem_cache_destroy(kvm_vcpu_cache
);
3533 kvm_async_pf_deinit();
3534 unregister_syscore_ops(&kvm_syscore_ops
);
3535 unregister_reboot_notifier(&kvm_reboot_notifier
);
3536 unregister_cpu_notifier(&kvm_cpu_notifier
);
3537 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3538 kvm_arch_hardware_unsetup();
3541 free_cpumask_var(cpus_hardware_enabled
);
3542 kvm_vfio_ops_exit();
3544 EXPORT_SYMBOL_GPL(kvm_exit
);